Method of turning journals of crank-shafts



(No Model.)

W. P. HOGAN.

METHOD OF TURNING JDURNALS 0P CRANK SHAFTS.

No. 339,776. ted Apr. 13, 1886.

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UNITED STATES PATENT OFFICE.

WILLIAM F. HOGAN, OF SAN FIIANGISCO, CALIFORNIA.

METHOD OF TURNING JOURNALS OF CRANK-SHAFTS.

SPECIFICATION forming part of Letters Patent No. 339,776, dated April13, 1886.

Application filed'A ugnsl Ill, 1895. Serial No. 114,349. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM F. HOGAN, of San Francisco, California, haveinvented a new and Improved Method of Turning Off the Journals ofCrank-Shafts, of which the following is a specification.

The invention relates to a Inethod of turning off the journals of suchshafts as, having become sprung from any cause, it would be inconvenientand costly to remove from their position to place in a lathe for thepurpose of trning up.

In the accompanying drawings, forming a part of this specification,Figure 1 is a transverse sectional elevation of a shaft, its pedes talfor journal-bearing, and the tools used in carrying out my method. Fig.2 is aside view of the same. Fig. 3 is a plan. Fig. 4 is a view of theshaft, showing all its supports. Figs. 5, 6, and 7 give isometricalperspective views of the tools used. In Fig. 7 two forms ofcutting-tools are illustrated.

In the several figures the same letters of reference are used toindicate the same parts.

A is the shaft, which in the present case is the propeller-shaft of asteamship. B is the pedestal of the bearing next the crank G. B B" arethe intermediate bearings, and B is the stern-bearing.

N ow, from some cause or otheras, for instance, original badworkmanship, or from the efl'ects of shrinking in a new crank-pin indouble crankshafts-let us suppose the crankjonrnal is untrue andeccentric with the other journals of the long shaft, to the effect ofcansing great friction and heating in the bearing, and it is necessaryto true up this journal. The ordinary practice has been to take theshaft out of the ship to a workshop to be trued up in a lathe.

The method of the present invention avoids this heavy expense andinconvenience, and the work is well done while the shaft remains inposition, as follows: First, I remove the cap of the bearing and takeout the hrasses from the pedestal B, leaving this journal free from allsupport, the shaft being supported alone by the intermediate and sternhearings in single-crank shafts. I then take a roughing-tool, D, made oftempered steel, having a series of saw-teeth cutting-points, let us say,

one-quarter of an inch apart. This tool is as long as the journal to beturned off less one pitch of the teeth, or one-quarter of an inch. Thewidth will he, say, two inches and a quarter, and the thickness fiveeighths of an inch, more or less. This tool I fasten with two or morebolts, E, to the block F, a metal piece the same length and width as thetool D, and as deep as will allow it to rest on the bottom of thepedestal, while the cutting-points of the tool are about level with thecenter of the shaft, as shown in Fig. l. I then place this block withits attached cutting-tool against the interior of the side of thepedestal and shim it up behind until the tool-points just touch theshaft at the point of its circumference least distant from the axis,which point can be determined by revolving the shaft slowly around andmeasuring to some fixed mark from different points in the circumference,as is commonly practiced insuch cases. hen the tool is properly set, Iput in the shore'blocks G, or they may have been loosely placed before,and drive the wedges H until the tool-block is firmly secured. Cure mustbe taken to set the tool parallel with the axis of the shaft, or thejournal will be turned tapering.

When one cut is made, say, one-sixteenth of an inch wide by each toothof the cuttingtool, I slack up the wedges and advance the toollongitudinally a sixteenth of an inch, and then, after tightening thewedges, make another cul, repeating the operation until the fourth cutis made, which will complete the first cut over the entire journal. If,now, an' other out be necessary, I slack up the wedges, move the toolback to its first position, and shim up the toolblock from behind withthe shim K of thin metal, then tighten the Wedges, and proceed asbefore. Finally, after making as many cuts with the roughing-tool as maybe necessary to take out the eccentricity of the journal, I change thetool for one, I), having square teeth, as shown in half of Fig. 7, andgo through the operation as before, taking, however, only a lightsmoothingcut for the last.

Any suitable means may be employed for turning the shaft around, eitherby hand or machinery.

That I claim as my invention, and desire to secure by Letters Patent, isas follows:

The method of turning off a journal of a shaft while in position afterremoving the sup- 5 port from that journal, consisting in firmly securing to the pedestal of the bearing of the journal 2. tool having aseries of cutting-teeth, then rotating the shaft in its remainingbearings against the cutting-tool, and in adjusting the cutting toollongitudinally and trans IO versely after each rotation of the shaft,substzmtially as described.

\VM. F. HOGAN. Viitnesses:

WM. M. FARRELL, JOHN V. B. PERRY.

